To get the melting point of a solution so, we will use this formula:
ΔT = - mKf
when:
m is molality of the solution
Kf is cryoscopic constant of water = 1.86 C/m
and ΔT is the change in melting point (T2 - 0 °C)
so, now we need to calculate the molality to substitute:
when the molality = moles NaCl / Kg of water
and when moles NaCl = mass / molar mass
= 2.5 g / 58 g/mol
= 0.043 mol
∴ Kg water = volume *density /1000
= 230 mL * 1 g/mL / 1000
= 0.23 Kg
∴ molality = 0.043 / 0.23 =0.187 M
by substitution:
T2-0°C = - 0.187 * 1.86
∴T2 = - 0.348 °C
Answer:
The number of carbon atoms is twice the number of magnesium atoms
Volume of Al:
D = m / V
2.70 = 96.4 / V
V = 96.4 / 2.70 => 35.70 mL
Mass of iron:
D = m / V
7.87 = m / 35.70
m = 7.87 x 35.70 => 280.959 g
hope this helps!
Answer:
morlecular element is oxygen
Answer:
the volume should be in cubic cm so I assumed that you wanted to write the same . then the answer is 5489.07 kg/m^3
